Spool.



J. W. EDSON.

SPOOL.

APPLiCATION FILED JAN-23.1913. RENEWED NOV. 13,1914.

1 14; 1 ,448, Patented June 1, 1915.

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as arr. ornrc.

JOHN W. EDSON, OF HINGHAM CENTER, MASSACHUSET'IQ, ASSIGNOR TO LOUIS E. VOSE,

OF WALPOLE, MASSACHUSETTS.

SPOOL.

Specification of Letters Patent.

Patented June 1, 1915.

Application fi1ed lianuary 23, 1913, Serial No. 743,748. Renewed November 13, 1914. serial an. $72,030.

T (l/lUlhOWI/it may concern: I

lie it known that I,' JOHN W. 'Eosozv, a citizen of the United States, residing at Ilingham enter, in the county of Plymouth and State of Massachusetts, have invented cerlain new and useful Improvements in Spools: and I do hereby declarethe't'ollowing to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to'which it appertains to make and use the same. i

The invention relates to 'thatfcl'ass of spools which comprise a central body and comparatively large fiat end disks or heads. Spools of this class are frequently subjected to rough usage; and the repeated concussions. due to the dropping of the spools or other causes. are liable to bend or break'the spool heads, or to loosen the fastenings by which they aresecurcd to the body.

It is the object of the present invention to provide a novel and improved spool which may be conveniently and cheaply iminut'actured from paper. pulp, leather, or

analogous board and tubing, and which is well adapted to withstand the rough usage to which such spools are subjected.

To this end the invention comprises a spool having a body and heads secured to the ends of the body which consist of disks of paper board or similar material provided with a hardened center to cooperate with the securing devices. and a surrounding unhardened zone for withstanding the blows to which the head are subjected. and for ab sorbing or cushioning the shocks and strains to which the fastening devices would otherwise be subjected. The hardening of the disks at the center strengthens the parts engaged by the devices which secure the beads to the ends of the body. so that the disks are not liable to become loose by reason of the distortion or compression of the heads at the points where they are engaged by the fastening devices. The surrounding unhardencd portions of the disks remain com;mratively soft and resilient, so that they are not liable to be cracked or broken by the blows to which the' are subjected. The resilient portions of the disks also yield to cushion any blow to which the heads are subjected. thus relieving the strain on the hardened and brittle centers. The edges of the disks may be and preferably are har.

dened so that they may receive a smooth finish and are not easily dented or injured.

ashipping spool upon' which tape, yarn or other material may be wound for transportation.

Figure 1 is a perspective view of a shipping spool embodying the invention in its preferred form; Fig. 2 is a'longitudinal sectional viewot the'spool; and Fig. 3 is a yiew indicating the manner in which the centers and edges of the heads may be hardened while the main portion of the heads remains in its original unhardened and re silient state.

The spool shown in the drawings comprises a cylindrical barrel or body portion 1 which may be cheaplv and conveniently formed from paper or other analogous ma terial and may betreated with a'hardening compound it found desirable. The heads 2 are in the form of flat disks which may be cut from paper board or similar material, and are secured against the ends of the body 1 by securing plugs. The plugs consist of paper tubes 3 adapted to fit within the body tube 1. and provided at their outer ends with flaring or conical flanges 4 adapted to fit within corresponding holes formed in the centers of the heads The plugs are provided with bushings 5 which are preferably formed of some plastic composition which may be readily molded. and which hardens to form a strong and unyielding core within the plug.

The centers of the head disks 2 are treated with a hardening compound so that that portion of the disk which is engaged by the flange 4 oi the securing plug, and is held against the abutting end of the barrel 1, is hard and unyielding. and etlectivcly resists any strains tending to compress or distort the head at this point. or to separate it from the end of the spool body or securing plug. That portion of the disk which surrounds the part engaged by the securing plug remains comparativcly soft and resilient. so that it will etl'ectivcly withstand blows which would crack and break the disk in case the whole diskwere treated with a hardening compound. The unhardened portion of the disk also springs or yields when the edge of the disk is subjected to a blow,

I so that the jaw or shock is cushioned instead of being suddenly-transmitted to that part of the disk engaged by the securing plug. The periphery of each disk is also treated with the hardening compound, so that the edge of the disk may be given a smooth finish and may also resist the blows which would otherwise dent or distort it.

The centers and edges ofthe disks may be 3 treated with hardening compound in any 1 suitable manner, provided that the remainder of the disk is protected from the action of the compound. For instance, the head disks may be secured between annular disks 6, as indicated in Fig. 3, the disks 6 being provided with center holes somewhat larger 15 3, and may then be immersed in the hardening compound. The center portions'of the disks 2, which are not covered or protected by the disks 6, will be acted upon by the hardening compound, and the peripheries of so the disks 2 will also be acted upon by the hardening compound, which will penetrate the edges of the disks to a limited extent. The zones on the disks 2 which are covered by the disks 6 will not be acted upon by the hardening compound, but will remain 1n their original comparatively soft and resilient condition. 7

While it is preferred to employ the specific construction and arrangement of parts and modified without departing therefrom.

Having explained the nature and object of the invention, and specifically described a form of spool in which it may be embodied, what I claim is 1. A spool comprising a body, head disks at the ends of the body each having a hardened unyielding center and a surrounding unhardened resilient zone, and securing devices engaging the hardened centers of the heads and securing the heads to the ends of the body.

2. A spool comprising a tubular body, paper head disks at the ends of the body each having a hardened centerand a surrounding unhardened zone, and securing plugs fitting within the body and provided with flanges engaging the hardened centers of the heads gng securing them against the ends of the 37A spool comprising a tubular body, paper head disks at the ends of the body each having a hardened center and edge and an intermediate unhardened zone, and securing plugs in the ends of the body engaging the hardened centers of the heads and securing them to the ends of the body.

JOHN W. EDSON. 

